Hand drilling-machine.



M. J. PFAFF.

HAND DRILLING MACHINE.

APPLICATION men NOV. 22. 1915.

Hum'rz l PFAFP.

INVENTOR rsns m. PNOm-LITNCL. WASNINGIDN. n c

MORITZ J. PFAFF, 0F PITTSBURGH, PENNSYLVANIA.

HAND DRILLING-MACHINE.

memes.

Application filed November 22, 1915. Serial No. 62,801.

T 0 all whom it may concern Be it known that I, Mom'rz J. PFAFF, a citizen of the United States of America, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Hand Drilling-Machines, of which the following is a specification. g

The present invention relates to an improved hand drilling machine, and more particularly to the supporting frame or attachment used in connection with the drilling machine, by which the latter may with facility be converted for use as a bench drill, as a typical breast drill, or with equal fa cility and effectiveness be utilized for special purposes.

The primary object of the invention is the provision of an attachment .or supporting frame for the drill which will be adapted for a wide variety of uses, which is durable, economical, and efficient, and which is simple in its construction and manipulation.

With these objects in view the invention consists in certain novel combinations and arrangements of parts as will be more fully pointed out in the following specification and claims.

In the accompanying drawings I have illustrated one complete example, adapted to three different uses, of the physical embodiment of my invention constructed according to the best mode I haveso far devised for the practical application of the principles of my invention.

Figure 1 is a side elevation of a drill and its supporting frame according to my invention, adapted for use as a typical bench drill. Fig. 2 is a front View of the device of Fig. 1. Fig.3 is a view similar to Fig. 2, but with the drill omitted for clearness of illustration. Fig. 4 is a side view of so much of the device as to indicate its use as a type of breast drill. Fig. 5 is a horizontal sectional view on line 11 Fig. 3. Fig. 6 is a sectional view on line 22 Fig. 3. Fig. 7 is a rear view of a portion of the frame at line 5-5 Fig. 1. Fig. 8 is a sectional view on line 44 of Fig. 1. Fig. 9 is a sectional view on line 33 of Fig. 3. Fig. 10 shows the drill and its supporting frame adapted for special use as will be described hereinafter. Fig. 11 shows a modified form of joint between the sections of the supporting frame.

For the purpose of illustrating the construction and operation of my invention I have utilized a typical form of drilling machine of the hand-type, embodying the drill or bit 1, the drill chuck 2 which are of usual or suitable type, and the drill also includes the gear wheel 3 of the bevel type which is in mesh with the bevel pinions 4 and 5, the latter revoluble on stem 8 and serving as an idler or guide pinion and the former rotating with the chuck 2, and the whole being supported by the slidable shank 6. A detachable crank handle 7 is employed to turn the bevel gear to operate the drill, and the upper portion of the stem 8 is attached to the screw feed bar 9 by means of the perforated sleeve 10 and cotter pin 11. The sleeve 10 is rigid with the screw bar 9 and the stem fits into the sleeve so that the cotter pin is passed through alined perforations in these two elements. The feed of the drill is accomplished in usual manner by revolving the hand wheel 12.

When used as a bench drill or for many special purposes, the drilling machine. is supported in my novel frame as shown in Figs. 1, 2, 3, and 10. In Fig. 1 it will be seen that the frame is a sectional one, comprising apair of upright bars 13 and 14: with a mortise and tenon joint at 15 and a screw bolt 16 to clamp the parts together and make a rigid and stable joint.

The upper end of the top section 13, it will be seen is bent at right-angles to form a bearing 17 for the feed screw bar 9, and the offset portion 18 of this section forms an abrupt bend or shoulder 19 arranged at right angles to the plane of the lower portion of this section. When used as a bench drill the drill is supported directly from this angle bracket 17 and the offset portion 18, and for this purpose the shank 6 of the drill is held to the frame through the slot 20 in the portion 18 and the set screw 21. This slot it will be understood permits the required movement of the drill spindle when so actuated by the feed screw bar 9. At the edges of the front side of the portion 18 oppositely disposed wings or flanges 22, 22, are provided as guides and retamers for the shank in its relationship with the frame.

The work holding plate 23 located directly below the drill or hit 1 is a circular disk with a screw bar 2a and a locking screw or pin 25. The bar is threaded into the angle bracket 26 which is detachable from the frame section 14;, and the angle bracket is loosely attached to the U-shaped portion 26 of the section 1 1 by a mortise and tenon joint as indicated at 27 in Fig. '1. The sectionll is fashioned with a pair of integral lugs 28 to form a depression or seat 29 for the horizontal portion of the angle bracket 26. Bymeans ofthe screw bolt'30 the'drilling' machine and its frame are'attach'ed or, clamped to the bench 31 through the medium ofthe U-shap'ed p01 into a sleeve 32 of the breastplate 33, and 1 an extra or] special handle 7 is fixed to the spindle by utilizing the threaded opening which accommodates the screw 21 when the 7 'drill is used'at a bench.

' V A special use of the drill and its supporting frame is illustrated in Fig. 10. Here the lower'section of the frame has been disconnected from section 13by withdrawing the lock nut or bolt16, and the work plate 23 is used; as a foot plateagainst the object to be drilled, while its screw bar 24 threaded in the perforated boss 34 of the section 13 adjusts the support in connection with the wooden or other brace 35. This brace bar Z 35 it will be seen rests at one end on the shoulder 19 of section 13, and at its other end is in contact with a suitablesupport.

The brace bar is held to the frame section clamping means comprising a yoke 36 and clamp bolt 37, and an additional bolt 38 at the side of the frame opposite to the bolt37 insuresand permits adjustmentbetween the, frame and brace bar.

. In Fig. 11 the ends of the two frame sections 13 and 14 have at their joint, teeth b as 13 and ll which mesh with each other andv provide an additional feature to insure stability 'of the joint. The perforated lug 34" is the same as-the lug 34in the other Views. l V I From this description taken in connection with my drawings it is evident that the deand 18 being adequate for holding and maintaining the device in position for doing its work in a workmanlike manner. The rounded cross sectional formation of the shank 6 which rests in the curved space between the two flanges 22, 22 insures a uniform and straight line movement of the shank as the feed screw is turned by the hand wheel.

Other meritorious features will be apparent to those skilled in this art, and need not be pointed out at this time.

What I claim is 1. The combination in a drilling machine of the bench type including its screw feed bar and slidable shank, of a supporting frame and means for clamping it to a bench,

an angle bracket on the frame for support-' ing the screw feed bar, and said frame having a slotted ofiset portion provided with side fiangesto receive the shank, and a set screw passed through the slotted portion and the shank for retaining the latter.

2. The combination in a drilling machine including its screw feed bar and slidable shank of a frame section having an angular bracket for the feed bar and said frame having an offset slotted portion forming a shoulder and means in connection with said offset portion for guiding and retaining the shank, a supporting brace bar adapted to engage said shoulder, a perforated lug on the frame section, and a foot plate having a screw bar engaging said-lug.

In testimony whereof I afiix my signature.

MORITZ J. PFAFF.

Copies of this patent may be obtained for five cents each, by addressing the, Commissioner of Patents,

' Washington, D. G. 

